Memory leak in Ubuntu 12.10/Gnome

I have Ubuntu 12.10 with gnome-core, evolution, skype. The machine is mostly doing nothing; I use it mainly as a base for ssh to other boxes.

Over a period of 3-4 days it gradually eats up swap space until it becomes unusable and I have to reboot.

I attach a zip file of 'ps' output generated over a period of days and a final 'top' screenshot taken just before a reboot.

lsb_release -rd
Description: Ubuntu 12.10
Release: 12.10

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: bash 4.2-5ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-49.74-generic 3.5.7.32
Uname: Linux 3.5.0-49-generic x86_64
ApportVersion: 2.6.1-0ubuntu13
Architecture: amd64
Date: Fri May 9 10:02:13 2014
ExecutablePath: /bin/bash
MarkForUpload: True
ProcEnviron:
 LANG=en_GB.UTF-8
 LANGUAGE=en_GB:en
 SHELL=/bin/bash
 PATH=(custom, no user)
 TERM=xterm
SourcePackage: bash
UpgradeStatus: No upgrade log present (probably fresh install)